data model in dbms | DBMS-Data models | Database Models in DBMS
Data model in DBMS: What are data models in dbms?What are the different categories of Data Models?
Different types of data models: • data model in dbms | DBMS-Data models...
Examples of Data Models.
What are Data models?
Data Model is a collection of concept to describe the structure of a database.
Most data models also include a set of basic operations for specifying data retrieval and data updating.
Categories of Data Models:There are 3 Categories of Data Models:
1.High-level (conceptual) data model
2. Low-level (Physical) data model
3. Representational(Implementation) data model
What is High Level Data Model?
High Level Data models or conceptual data model provide concepts that are close to the way many users perceive data.
Conceptual data model uses concepts like entity, relation and attributes to describe the data model.
Describing the structure of a database such that even a kid or a lay man would understand it easily.
Low level Data model
Low level data model or physical data model describes how the data is stored on the physical storage.
Low level data model is not for common end user.
Physical data model is for computer specialist.
Representational data model:
Representational data model is an intermediate type of data model between the two extreme data model.
Representational data model is also called implementation data model because it is neither so difficult to understand for the end user nor at the same time it is not far from how the data is stored on the computer storage.
Representational data model hide details of data storage disk, but can be implemented on a computer directly.
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